	transamerica ta to buy sedgwick sdwk l unit transamerica corp s transamerica insurance co said it signed a definitive pact to buy a pct interest in sedgwick group plc s river thames insurance co transamerica will buy mln newly issued class a shares of river thames for dlrs per share sedgwick wil retain a pct interest in river thames which is a property liability reinsurer the agreement subject to shareholder approval is expected to close by the end of the year the company said in river thames reported net premiums written of mln dlrs reuter 
